Sometimes I Shazam random songs. I don't even have to like'em or anything.. I just do it. Press the big blue button and wait for it to do its job. I'm always sad when it says it's sorry and returns no result. "They didn't quite catch that. Try again". Who does?
Sometimes I Shazam random noises on the metro, Hoping it will pick up the coolest soundtrack of a movie I'm in, Just before the credits, When everything goes dark - but not because of a random suicide bomber that hates life and wants revenge or something. It returns no results and the TV suddenly goes louder in my head and there are 23 victims and we're all posting kittens on Facebook to show that we're not afraid.
Sometimes I Shazam my parents voices while they're telling me how their day went and I discover really cool indie artists that make me listen to their work in a loop.
Once, I Shazamed your heartbeat while you were sleeping. It returned my name. Can't remember the album, but it had a nice cover photo.
I never Shazamed my own voice, nor my heartbeat. I'm too afraid it'll show nothing worth listening to.